We found this simple toy organ circuit in the February 1968 issue of Radio Electronics magazine. The transistors were common at the time and the transformer was from a transistor radio output.
This article is old, from 1994. But, for those who have an old PC and want to use a joystick from...
This flasher for power loads such as lamps and LEDs uses a 555 as an oscillator. The supply...
The output current is of the order of 100 mA maximum, but the transistor used can be changed for...